| 요약2 |
In this study, the real-impact force (height of drop of rubber ball 40 cm) reduction performance was evaluated in the reverberation chamber and in the 210 mm bare slab of the apartment house, depending on the application of the floor surface finishing material. There are a total of 20 types of mats made of single, composite materials. In addition, the impact sound was reduced by residents of apartment housings during installation of floor surface finishing materials, focusing on the 125 Hz and 250 Hz frequency bands. The reduction performance of about 10 dB in the PE structure was shown when applying a single structure of mats in the reverberation chamber. It was also shown that the reduction in noise perceived range is obtained from Case 6 to 9 (PE 20 mm ~ PE 50 mm), a floor surface finishing material consisting of PE. In the composite structure, it was shown that Case 2, 3, 4 (PE 20 mm + PU 10 mm, PE 10 mm + PU 20 mm, PE 20 mm + PU 30 mm) satisfies the range 3 dB of impact reduction. Impact sound reduction performance (height of drop of rubber ball 40 cm) at bare slab in apartment buildings was found to be over 7 dB in Case 9(PE 50 mm) in single structure. In addition, it was found that the impact sound recognition range of 3 dB is secured when applying the single structure of the floor surface finish in case 6, 7, 8, 9(PE 20 mm ~ PE 50 mm) and the composite structure Case 2, 3 (PE 20 mm + PU 10 mm, PE 10 mm + PU 20 mm). |